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x in (-oo:+oo)
-3*x-5 = -(7*x)-45 // + -(7*x)-45
7*x-3*x-5+45 = 0
4*x+40 = 0 // - 40
4*x = -40 // : 4
x = -40/4
x = -10
x = -10
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